Radio tuning device



Feb. 7, i950 L. M. TEMPLE 2,496,424

RADIO TUNING DEVICE Filed July l0, 1946 2 Sheets-Sheet 1 www FIG. 2

7 4 1/4 52 59 333 33C /oo /1/ 35 412 543443/3 53 5458 s# 75 SE';'ell-UA1 nxt- PE- j L. M. TEMPLE RADIO TUNING' DEVICE Feb. 7, 1950 2Sheets-Sheet 2 Filed July 10, 194e Patented Feb. 7, 1950 RAMOTUNINQDEWCE -Lemue1 M.:Temple,-ScarsdalefNs' assigner to :RaytheonManufacturing Company, xNewton, ali/lass.,-v a Ycorpo ragtion ofDelaware `Appiitatim Ju1yg 1o, 1945sena1 10,652,505

This invention relates to radio receivers ofthe subfminiature type, andmore particularly tothe construction of -suchdevices It is a main objectof the present-invention to provide a device of the typedescribed havingsuch e dimensions that same can-be convenientlyW carried on thepersonrof Vtheruser thereof.

Another objectof the present invention is 4to provide a device of the`type described which shall be encompassed-within a framework-ofwsubstantially shallow proportions suitable forinsertionfin thevest-pocket of a user thereof.

For amore complete comprehesion-ofthe above and other objects of Ithepresent'invention,.refer ence is hadveto 'the f' following descriptionandA attached drawings, in which:

Fig. 1. -is aplanview ofthe deviceof'the present invention;

Fig. 2 represents a View ofv one edge oivthefdevice of the y presentinvention ..to=i11ustrate,-. substantially, the shallowconstructionlthereof;

Fig. 3 depictsA a-plan view of `the.opposite2side of Fig. 1; y

Fig. 4 presents an end View of the device-illustrating the controls andfrequency indicating` means;

Fig. 5 is a cross-sectional viewof' the,Y tuning drive; and

VVFig. 6 presents `anexploded-viewlpffthe'device.

-fReferring toFigs: 1,:2; and 3, thefidevice-ofethe -present inventioncomprises a plurality-offshallow compartments, 13,. Il, l2,4 |3.and 14.mWhen speaking of compartmentsin connection with the description of thedevice of this inventiom'the term encompasses metal framemernbersll,`3|,

32, 33, 34, 35, 36, 31 and cover 49 (.cover shown inpartial-cross-section). A11 lois-,said compartments are combinedfintoalshallow substantially rectangular assembly.

Compartment encompasses a-.p1urality'of capacitors l5, 16, 11,118, andapair-of resistors I9, three of said .capacitors beingfastenedv to framemember130, for example; by riveting -the supporting bands -I 5A, .1|Afand'lflA thereto. vExtending into compartment i0 are a `plurality ofvY ;.;2 placed, within compartment jl3,V together -f withshieldedpermeabilityhtuned stages 38:39, and-40, saidjlast-named[stagesn being ilrmly affixedIl to fr ame vmemberjby `fastening extendedportions Y4 i j 42, andi 43 ofsaidshieldedstages to said frame member-35with screws; 44; 45, andhy as -shownin Figs-2 and. Also'plac'ed withinsaid compartment I3 are shielded intermediate-frequency stages-41andwl,l said stages being-fastened to frame member 3l by screws 50-and5! Capacitors-'52,153,- andfll are soldered toterminal points 55,f56,vlandel,` as -indicated-more f-clearly in Fig: 2, resistor-58 beingvsolderedto Ater- -minal pointy 155. IThe aforegoing terminal4 pointsare*` carriedbyeoinsulatingmemben.33 which itself isflfastenedl-toirame-emembere.

Within compartmentd Zand heldenk good electrical contactbyspring'members S3 t l ,-.and 32, aref dryvcellsi 63, 64,y andl vE55. eCell"334s -thefhigh potential source whilecells Vtiliand.Y 65 efurnish Lthenecessary current for:thefilaments` of electron-:discharge*tubes-125,@25,221# 28, and-.129. .,Spring members-30; 6I,-and 63 are heldvinrpositiorrby supporting-members:610A, 61A, and32A-said lastnamed supportingmiembers being-rigidly a-lixed to-framemember .-32.

A novel switchingi arrangement. vfor said `dry cells isprovidedby-i-rame..member; 32. .Said memben32 isattaehedto a secondmetalemember -65. `by. screws 'l l), `said .member 6 hav-ing. a slightlylarger areafthan saidmemberfSZ. Aknurled` and threaded memberv'tfiszthreadedly..engagedfwith aninsulating, member Q68 `througlri aperture63 in membery 34` and through. apertures .(notshown) .in membersi 32and. .66. Rotating 1 member.; El .in v4the proper:direction.causes.memben-32v to. separatel :from Jframe, member. ..34 .atpointr .713-, and .by this means tobpenrthe circuit.,which.conductsrytheVIV,potentials suppliedby-drycells 64, and, said t.frame/r members..being: ithe, :ground .point jfor .the nradio. components of lthepresentdevice. fFig; 3 f shows .the..position ,ot frame.,.memberl 34 ,inintimate..contact:withmerriberglt2v and inthis positionthepotentialecarryina:circuit -is closed oncom- Apleted andv current.supplied l:to `the components lof the device.

. Attention. is..cal1ed, to uframe. member..V 33..which .is-.madez.upoffitthreegfparts, .33,133A,v and 353B. .Members 33....and33A-are.made-.-of.meta1, spaced apart. land riveted l.toinsulating,-memberw33B- The purpose of E this..par.ticular .construction.is 4to avoidy conductingcurrent .rfrom.-.dry. cella. .63,y 54yandfthrough `this part .of sthezstructure as',y its function is4 to.support said: drycells within. compartment l-l 2I andmmemberf33A..particu1arly.frunc tions to maintain members 32 and 86 in positionat point 15. The bent portion 33C of member 33A laps over member 62A andacts as a fulcrum at point 15 for members 32 and 66.

Metal contacts 1| and 12 are attached, by riveting, for example, toinsulation member 14. and current from the plus side of theaforementioned dry cells is conveyed via conductors 16 and 11 to thevarious components requiring said current.

Member 66 is made slightly larger, in this particular embodiment, thanmember 32, said members being held together by screws 10. Thisparticular arrangement maintains cover 49 in position when it is slippedover the entire assembly as the combination of 32 and 66 form a.shoulder 66A against which the cover 49 abuts. If it is necessary toremove said cover to repair or replace any of the components, member 61is unscrewed from its position entirely and combined members 32 and 66lifted from the assembly.

Fig. 2 illustrates an edgewise view or" the structure and shows in planview frame members 33, 33A, 33B, and 35 and end views of frame members32, 66, 34, and 36. It also shows inductors 38A, 39A, and 40A, saidinductors being iitted into apertures in said frame 35. These lastnamedinductors are enclosed in shielded stages 3s, 39, and 40.

Volume control knob is a combination of a hollow knob with a variableresistance (not shown) therein and is attached to member 36.

Placed between frame members 36 and 18 is a tuning drive whichcomprises, as illustrated in Figs. l, 2, and 3, rack 19, and racksupport 80.

Said rack support is fastened to member 36, for

example, .by screws 8|, 82, and 83; screw 83 also holds in place, onmember 18, a transparent dial 84. Fastened to rack 19, for example byscrews 85, is a fiat L-shaped member 86, said L-shaped member havingfastened to the longer arm thereof a plurality of permeability tuningcores 81, 88, and 89. Attached to said L-shaped member at the junctionof the arms of same is a dial pointer 90, said pointer being fastened tosaid L-shaped member, for example, by screw 9|.

Fig. 4 is an open view of the tuning drive and illustrates in greaterdetail the arrangement of rack 19 and the driving pinion gear 94 whichimparts to said rack a linear motion. Said linear motion is alsoimparted to member 86 which supports the powdered iron tuning cores 81,88 and 89 as described above in connection with Figs. 1, 2, and 3.Pinion gear 94 is tightly fitted to shaft member 93 as by sweating sameonto said shaft or by other suitable means. A dial 84, having inscribedthereon designations for locating desired broadcast programs, isfastened over an opening in member 18 by screw 83.

Fig. illustrates in cross-section the manner in which rack 19 is held inposition between members 36 and 18. Member 36 has along its entirelength a slot 95 into which is tted a raised ridge 96, said ridge beingintegral with rack 19 and continuous along the entire length thereof.The opposite side 91 of said rack is in slidable contact with member 80,said member 80 being held in this position by screws 8| and 82 asillustrated in Fig. 3. Adjacent driving pinion gear 94 is aspring-loaded pinion gear 98 having the same number of teeth and pitch,but not as thick as gear 94, said gear 98 being loosely fitted to shaft93. Disposed between said gears is helical spring member 99, said springbeing fastened at one end to gear 94 in a recess therein, the other endbeing bent perpendicular to its length and placed man 4 aperture in gear98. Gear 98 is rotated so that spring 99 becomes tightly wound and theteeth of rack 'i9 are meshed with the teeth of both gears 94 and 98.This causes the teeth of gears 94 and 98 to exert pressure in oppositedirections within the working depth of the teeth of rack 19 and thuseliminates play or backlash between said rack and pinion. Tuning knob 92is attached to shaft 93 vby suitable means such as a set screw or thelike.

' Despite the diminutive size of the device of the present invention,the novel construction of the frame members and the means for combiningthem provide a structure which can be readily and rapidly assembled. Itwould appear at first glance that a radio receiver constructed alonglinesdescribed and illustrated would present a most difficult wiringproblem. Such is not the case. Every frame member serves to support someof the various components that go into the construction of the presentdevice and it will be shown by Fig. 6, an exploded view of the device,that the novel arrangement and configuration provide means for rapidwiring and assembling of said device.

Referring now to Fig. 6, frame member 35 has affixed to it permeabilitytuned stages 38, 39, and 48, said stages being fastened to said framemember 35 in the manner hereinbefore described. Also supported by saidmember are a plurality of capacitors 52, 53, and 54 and resistors 58 oneither side together with a terminal strip 59 to which said capacitorsand resistors are fastened. The wiring of components for this particularframe member is completed and suilicient lengths o! wire are provided toconnect these last-named stages to other components. Both ends |02 and|03 are turned up perpendicular to the main part of member 35, said endshaving apertures |04 and |05 provided therein for the passage offastening means therethrough. Also attached to said member 35 isearphone |30, the leads 3| from said earphone serving as an antenna andconductor for the audio frequency output of the device.

Now frame member 31 is prepared and it carries sockets 20, 2|, 22, andintermediate stages 41 and 48. All the Wiring that can be completed forthis structure is done and as before suiiicient lengths of wire |06 areleft unterminated for connection to other stages or components. The ends|01 and |08 of member 31 are slightly narrower in width than the mainbody of said member to form tongues which t into apertures |09 and ||0provided for them in members 34 and 36, respectively.

Frame member 30 supports a plurality of capacitors and resistors, aportion of the capacitors l5. |6, and |1 being supported by metal bands!5A, |6A, and |1A surrounding same, said bands being riveted, forexample, to frame member 30. All the aforesaid components are Wired asex plained hereinbefore and enough extra wire left for connections toother parts of the device. Ends ||2 and ||3 are bent perpendicular tothe main member 30 and have apertures I4 and I5 provided therein forfastening to frame members 34 and 36. Notches ||8 and ||1 are providedto hold in position frame member 3|.

Frame member 3| supports two sub-miniature tube sockets 23 and 24, whichin turn support two sub-miniature radio tubes 28 and 29. The socketshave wires ||8 connected thereto and as in the other frame memberssufficient wire is left to-,providefor other connections. Framelmemarcane:

ber 3| is formed with twoextended portions ns and to t two notches' 2|and |22 in frame member 34.` The edge opposite4 the extended portions||9 and |20 has a notch |23, which fits across the material in the spacebetween notches H8 and ll'i'with a snug fit. When ally the frame membersare fastened together, frame member 3| will be held firmly betweenframe" members and 34.

Frame member 34 is a substantially L.Shaped member, the base thereofhaving a portion I 24 bent perpendicular thereto and. in a directionaway from the leg of said frame member 34, said last-named leg havingfastened thereto an. insulating member |25 for supporting thereoncontact plates 1| and 12 (not shown in Fig. 6 but illustrated in Fig.l). Lead wires |26 and |21 are fastened to said contact plates andprovide the means for conducting current to the radio tubes. Attached toinside of the junction at bent portion |24 is an insulating member 6Bhaving affixed therein a tapped metal member for receivingl threadedmember 61, the insulating member 68 serving to electrically insulatemember 61 from frame member 34 when said members are separated asexplained hereinbefore.

Members 33, 33A, and 33B form an integral member, 33 and 33A beingformed of metal and 33B of an electrically insulating material such asBakelite or the like. Both members 33 and 33A have one end bentperpendicular to the main portion thereof. End |28 has apertures |29provided therein for fastening said member 33 to member |25. End 33Cserves as a fulcrum, when placed in space 15 between members 62A and 36,for members 32 and 66 when same are caused to move out of contact withmember 34 by manipulation of threaded member 61 (as illustrated in Fig.1). Spring members G, 6|, and 62 provide the urge necessary to separatemembers 32 and 66 from frame member 34. Said springs are held inposition on member 32 by innerly grooved, partially circular members60A, 6|A and 62A, said springs providing a strong point of contact withthe negative side, for example, of dry cells 63, 64 and 65 (not shown inFig. 6 but illustrated in Figs. l, 2, and 3).

The combination of members 34, combined members 33, 33A and 33B, andcombined members 32 and t6, form a compartment for the aforementioneddry cells.

Frame member 36 serves to support the tuning drive mechanism whichincludes rack 19, rack-supporting member 3U, driving pinion shaft 93 andother portions of said drive (not shown in Fig. 6) .l Member 8|! isfastened to member 36 as hereinbefore described and thus holds in placethe various components making up the tuning drive.

Member 18 supports the combined volume control and knob |03 andtransparent dial 84. It is provided with an aperture 18A which ts overboss 83A, and shaft member Q3 extends through said aperture 18A whenmember 18 is fastened to member 36 through apertures 36A and |05. Aftermember 18 is fastened in place to member 36, tuning knob 92 (see Figs.l, 2 and 3) is fastened to shaft 93.

After all the preliminary wiring of the various components, ashereinbefore described, has been done, member 31 is fitted to member 36by insertion of tongue |61 into aperture |(l. Then member 34 is placedin position so that tongue |68 ts within aperture |29, member 34 beingfastened to member 35 by means of screws, or the like, inserted throughapertures |04 and 34A. Member 6g 3i is now wired in position by'connecting wires H18. After all the necessary wiring connections' are'made, end |3 of frame member 30 is fittedto member 36 and fastenedthereto by means' of screw 83 inserted through aperture 36A and threadedaperture H5. Member 3| is'now placed in notches ||6 and I1 of member 3|)and the ex.-- tended portions ||9 and |20 placed in notches |2| and |22-of member 34. With these lastnamed components in position, end portionI2A is fastened to portion |24 of member 34 by means of screws (notshown), orV the like, inserted through aperture 34B and-threadedaperture |4. Member 33 is fastened by screws (not` shown) to memberThese aforementioned oper-ations point out the ease with which thedevice may be assembled; although the steps indicated are the preferredyones, the assembly may' bel carried out in any*v manner` desired. Allfastening is accomplished by the use of Screwsv or bolts which arepreferred,

although it is also possible to useother means for holding the various'compartments together and still retain the feature of ease in assemblingand dismantling the device of the present invention as by means ofinterlocking or the like.

Members 32 and 66 are fastened together by screws 19 and are the onlymembers not semipermanently fastened. This arrangement permits the userof the device to replace the dry cells when necessary and requires onlythat member 61 be completely unscrewed from threaded member I 24A.

The device as described provides a novel construction, the overall depthof said structure being governed by the thickest component therein.Although this particular embodiment describes the use of the device inconnection with a miniature radio receiver, it is also adaptable tohearing aids, electronic stethescope amplifiers, and other devicesrequiring a thin flat structure according to the device of thisinvention.

Having described the device of the present invention, it should beunderstood that many modiiications Will occur to those skilled in theart but such modifications do not represent a departure from the truespirit and scope of the present invention.

What is claimed is:

l. In combination, a radio receiver having a substantially rectangularmetal supporting frame therefor, said frame being divided intocontiguous compartments for supporting therein the components of saidreceiver, and all of said components lying in a single common planetransverse to the thinnest dimension of said frame to form a shallowassembly, the depth of said assembly being substantially equal to thethickness of the thickest one of said components.

2. In combination, a radio receiver having a substantially rectangularmetal supporting frame therefor, major components of said receiver beingsupported between the longer parallel members of said frame, tuningmeans for said receiver, said means being supported by one of theshorter members of said frame, and all of said components lying in asingle common plane transverse to the thinnest dimension of said frameto form a shallow assembly, the thickness of said assembly beingsubstantially equal to the thickness of the thickest one of saidcomponents.

3. In combination, a radio receiver having a substantially rectangularmetal supporting frame therefor, major components of said receiver beingsupported between the longer parallel members' of said traine, all of'said components lying in a single common plane transverse t0 the depthdimension 'of said frame to form a shallow assembly, the thickness ofsaid assembly being substantially equal to the thickness of the thickestone of said components, and a dust-proof cover completely enclosing saidframe and said components.

4. In combination, a radio receiver having a permeability tuning devicecomprising at least one inductance and a movable iron core sldablymounted within said inductance, a rack attached to said core andextending parallel thereto, rotatable means threadedly engaged with saidrack for imparting linear motion to said rack and core, a rectangularmetal frame for supporting said tuning device, rack and rotatable meanswithin the con'nes thereof, a dust-proof cover completely enclosing saidframe and the tuning device components therein, and means locatedexteriorly of said cover for manually actuating said rotatable means.

LEMUEL M. TEMPLE.

il REFERENCES CITED The following references are of record in the fileof this patent:

Candid Radio Receiver of the Sonora R. and T. Corp.

